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Earnings Per Share - Narrative (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Nonvested Stock Awards        
Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 0.3 1.6 1.4 1.6